Samuel telford button



(No Model.)

. S .T.DUTTON. INTERLOCKING APPARATUS FOR RAILWAY SIGNALING.

No. 503,530. Patented Aug. 15', 1893.

UNITED STATES PATENT OFFICE.

SAMUEL TELFORD DUTTON, OF VVORGESTER, ENGLAND.

INTERLOCKING APPARATUS FOR RAILWAY SIGNALING.

SPECIFICATION forming part of Letters Patent No. 503,530, dated August 15, 1893.

Application filed January 14,1893. Serial No.458,4.25. (No model.)

a specification.

My invention relates to locking apparatus for railway points and signals, which I construct with a View to simplicity of parts and the reduction of friction inthe gearing and also to shorten the draft upon the tappets.

In order that my invention may be better understood and more readily carried into effect I will proceed to describe the drawings hereunto annexed.

Figure 1 is a side elevation showing a lever in its normal position,and the means by which the locking mechanism is operated. Fig. 2 is a front elevation of Fig. 1. Fig. 3 is a plan of the locking box or trough, showing the interlocking tappets, their notches, and the locks. Fig. 4 is an enlarged view of the fulcrum of the lever showing the slot in the projection beyond the fulcrum, in which the pin connecting the links to the tappet operates. Fig. 5 is a plan of Fig. 4:.

The same letters refer to the same parts or substitutes therefor in the several figures of the drawings.

a is the main lever which may be a signal, point, point lock, or other operating lever for signaling purposes.

I) is the catch handle at the back of the lever a.

c is the rod connecting the catch handle to the drop box d.

cis the continuation of the catch rod below the segment of the locking frame.

f is the cross bar centered at g to the lever a, and connected at one end to the continuation eof the catch rod 0. The other end of the cross bar is connected to a pair of links h. The links it are connected in their turn by means of the pin 2' (which pin imoves in a slotj) to the pair. of links 7a. The links it in their turn are connected to the interlocking tappet Z mis the lockingbox ortrough through which the tappets Z move and in which the locking is eifected; n is a lock in the locking trough.

Z is a notch in the tappet P. This is alocking notch. Z is a notch, also in the tappet i but is a releasing notch. The lock 0' is shown in the bottom of the locking trough;Fig. 3.

The operation of myinvention is as follows: lVhen the catch handle I) is raised the cross barf is so. operated that a downward move ment is given to the links h, the pintis moved to the bottom of the slot j, and the links 7.; and the tappet Z are thereby operated so that the locking of conflicting levers is eifected. On referring to Fig. 3 it will be seen that the tappet I in the downward movement which it takes presents a straight surface to the lock n; the notch Z having moved downward, thereby holding the lock it into the notch in the next tappet l the lever connected to the tappet Z is thereby locked. \Vhen now the movement of the lever or takes place, the projection 0, being bolted about the fulcrum to the lever a, is moved downward so that the links 75 are moved into the position that the pin 2' takes the position (in dotted lines, Fig. 4.) of 19; this gives a very slight backward movement to the tappet Z It should be understood that in the first movement of the tappet by the raising of the catch handle the tappet Z is moved some short distance beyond the required movement to effect the locking, so that when the slight backward movement takes place, of the pin *6 assuming the position of p (dotted lines, Fig. l), there is still latitude allowed for the perfect looking to have taken place. On the catch handle being now re placed in the pulled over position of the lever a further forward movement is given to the tappet Z by an upward movement of the pin 2' assuming the position q (in dotted lines Fig. 4). This moves the tappet Z suiiicient- 1y forward so that the release notch Z as in Fig. 3, comes opposite a lock such as 0', which look would be connected to any lever which would be normally locked and should be released by the forward movement of the tappet Z connected to a lever such as a. The return motion of the lever a to its normal position is practicallyareverse movement of the various parts until they assume their normal positions as in Fig. 1. The slot j beyond the fulcrum is curved to a radius equal in length to the links 70. The curve of the slot j regulates the progressive movement of the tappet so that at any part of the stroke of the lever coincides I otally connectingthe said tappet with the said crossbar, and the; projection'o' on the op'erat- 'ing lever'provided with a slot adapted to guide links, snbstan-t the rate of motion ofthe tappet i with that of the catch rod G-.6.- I

It is obvious that my invention'is'applica: ble to the ordinary lever and spring catch handle or to ordinary segmental plates with front and back notches, and to what is known as ordinary tappet locking. q I

Having fully describedmy invention Wish I it to be distinctly understood that I do not claim the principle of tappet lockin g generally;

- Witnesses:

nor do I claim the principle of operating tappets by means of a catch rod; but,

What I do claim, and desire to secure by Letters Patent, is

Y The combination, with a pivotedoperating lever provided with, a catch rod, of'a cross- 1 bar pivotally connected to the said leverand tially as set forth. 7 r 'Intestimony whereof I catch'rod, a stationary locking box, a tappet sliding in the said boX,the links h and la pivthe meeting ends of the said signature in the presence of two Witnesses. SAMUEL TELFORD DU'ITON.

G. W. BULL, Railway Signal Woo ks, Worcestev Accountant. i

: A. CROFT, v e

hereuntoaffix my Railway Signal Worke, Worceste Clerk to i Mess rs. Button at 00., Ltd. 

